diff --git a/examples/glFVarViewer/glFVarViewer.cpp b/examples/glFVarViewer/glFVarViewer.cpp
index bae93fe8d7..4d5fd8a20b 100644
--- a/examples/glFVarViewer/glFVarViewer.cpp
+++ b/examples/glFVarViewer/glFVarViewer.cpp
@@ -520,13 +520,15 @@ fitFrame() {
 
 union Effect {
 
-    Effect(int displayStyle_, int uvDraw_) : value(0) {
+    Effect(int displayStyle_, int singleCreasePatch_, int uvDraw_) : value(0) {
         displayStyle = displayStyle_;
+        singleCreasePatch = singleCreasePatch_;
         uvDraw = uvDraw_;
     }
 
     struct {
         unsigned int displayStyle:3;
+        unsigned int singleCreasePatch:1;
         unsigned int uvDraw:1;
     };
     int value;
@@ -539,7 +541,7 @@ union Effect {
 static Effect
 GetEffect(bool uvDraw = false) {
 
-    return Effect(g_displayStyle, uvDraw);
+    return Effect(g_displayStyle, g_singleCreasePatch, uvDraw);
 }
 
 // ---------------------------------------------------------------------------
@@ -591,6 +593,11 @@ class ShaderCache : public GLShaderCache<EffectDesc> {
             ss << "#define PRIM_TRI\n";
         }
 
+        if (effectDesc.effect.singleCreasePatch &&
+            type == Far::PatchDescriptor::REGULAR) {
+            ss << "#define OSD_PATCH_ENABLE_SINGLE_CREASE\n";
+        }
+
         if (effectDesc.effect.uvDraw) {
             ss << "#define GEOMETRY_OUT_FILL\n";
             ss << "#define GEOMETRY_UV_VIEW\n";
diff --git a/examples/glFVarViewer/shader.glsl b/examples/glFVarViewer/shader.glsl
index dd306dcfc3..73803ea34e 100644
--- a/examples/glFVarViewer/shader.glsl
+++ b/examples/glFVarViewer/shader.glsl
@@ -106,6 +106,9 @@ OSD_USER_VARYING_ATTRIBUTE_DECLARE
 
 out block {
     OutputVertex v;
+#ifdef OSD_PATCH_ENABLE_SINGLE_CREASE
+    vec2 vSegments;
+#endif
     OSD_USER_VARYING_DECLARE
 } outpt;
 
@@ -124,6 +127,9 @@ void main()
 #if defined OSD_COMPUTE_NORMAL_DERIVATIVES
     outpt.v.Nu = vec3(0);
     outpt.v.Nv = vec3(0);
+#endif
+#ifdef OSD_PATCH_ENABLE_SINGLE_CREASE
+    outpt.vSegments = vec2(0);
 #endif
     // --
 
@@ -157,12 +163,18 @@ void main()
 layout(triangle_strip, max_vertices = EDGE_VERTS) out;
 in block {
     OutputVertex v;
+#ifdef OSD_PATCH_ENABLE_SINGLE_CREASE
+    vec2 vSegments;
+#endif
     OSD_USER_VARYING_DECLARE
 } inpt[EDGE_VERTS];
 
 out block {
     OutputVertex v;
     noperspective out vec4 edgeDistance;
+#ifdef OSD_PATCH_ENABLE_SINGLE_CREASE
+    vec2 vSegments;
+#endif
     OSD_USER_VARYING_DECLARE
 } outpt;
 
@@ -211,6 +223,10 @@ void emit(int index, vec3 normal)
     outpt.v.normal = normal;
 #endif
 
+#ifdef OSD_PATCH_ENABLE_SINGLE_CREASE
+    outpt.vSegments = inpt[index].vSegments;
+#endif
+
 #ifdef SHADING_FACEVARYING_UNIFORM_SUBDIVISION
     // interpolate fvar data at refined tri or quad vertex locations
 #ifdef PRIM_TRI
@@ -342,6 +358,9 @@ void main()
 in block {
     OutputVertex v;
     noperspective in vec4 edgeDistance;
+#ifdef OSD_PATCH_ENABLE_SINGLE_CREASE
+    vec2 vSegments;
+#endif
     OSD_USER_VARYING_DECLARE
 } inpt;